OggRaw - Revision history

Saoshyant at 04:52, 4 February 2008

2008-02-04T04:52:10Z

← Older revision		Revision as of 04:52, 4 February 2008
Line 1:		Line 1:
		+	{{historical}}
	== Purpose ==		== Purpose ==

Jmspeex at 09:49, 8 July 2006

2006-07-08T09:49:06Z

← Older revision		Revision as of 09:49, 8 July 2006
Line 1:		Line 1:
-	~~<div id~~=~~"nolabel" style~~=~~"overflow:auto;height:1px;">~~	+	== Purpose ==

		+	=== For the Ogg Media Framework ===
		+	Within OggStream, codecs are recoded (encoded, decoded, or transcoded) from one format to another. For example, a Vorbis codec plugin could be used to convert a Vorbis I stream to a PCM stream. Ogg packets of these streams are imported and exported from OggStream, and several of these conversions can be used in sequence (plugin chaining) to attain a desired output from any supported input within that media type.

-	~~[http://www.action-meds.com cheap butalbital]~~	+	Some codec plugins will only support one or two raw codecs, providing translations between different formatting options as needed, such that (ie) if an Ogg FLAC file contains 64-bit float data, and the media player attempting to play this data only supports 16-bit signed int data, a second plugin could provide the conversion from 64-bit float to 16-bit signed int.
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-	~~[http://spaces~~.~~msn.com/cheap-tramadol/ cheap tramadol]~~	+	Having these uncompressed codecs is, thus, essential for implementing the new Ogg media framework as it depends on interchange codecs which all applications desiring to work with a certain media type can reasonably support.
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-	~~[http://www.replicahours.com/index.php?cPath~~=~~51_25 fake rolex daydate]~~	+	While losslessly compressed Ogg codecs are available for both audio and video, some applications (ie, live recording, editing, etc) find the higher CPU requirements for processing these formats less desireable than the need for additional storage capacity. Many of these applications require syncing information not provided sufficiently by RIFF (.wav/.avi) or Quicktime, where using an uncompressed codec within Ogg provides excellent cross-bitstream syncing, or the application may be designed around the Ogg media framework where storing data in an uncompressed Ogg codec makes encoding it later while keeping comments/etc is made easier.
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-	[~~http://www.thepublish.com press release~~]	+	=== For Codec Development ===
-	~~press release~~, ~~articles~~, ~~business directory~~, ~~ezines, classifieds, job search,business free b2b search advertising aerospace defense agriculture airlines automotive chemicals computers electronics semiconductors energy utilities~~	+	As we experienced with Ogg [[Theora]] development, there is a shortage of simple raw data formats which support the capabilities being tested in codec development. Additionally, the lack of inter-codec sync information (ie, when using .wav & yuv4mpeg2) for these non-Ogg raw formats makes debugging more difficult than it should be.

-	~~[http:~~/~~/www~~.ez-~~agents~~.~~com wholesale atv~~]	+	These uncompressed Ogg codecs will hopefully solve these problems, by allowing a wide variety of data formatting options and proper inter-codec syncing for testing and development. We should not be limiting ourselves to what existing raw formats support.
-	~~</div>~~	+
		+
		+	== Design ==
		+
		+	=== Why Not FourCC ===
		+	The RIFF/Quicktime set of codecs have several dozen raw codecs each supporting very specific formatting options. Many of these are special purpose, never used on a wide scale, and many formatting options are not available in this system. This situation was designed under the philosophy that if an application supports a codec, as identified by the 32-bit codec identifier (aka FourCC), that it would be expected to support all the format options possible with that codec.
		+
		+	That system, at it's heart, is what we call "FourCC". Media frameworks designed around FourCC identify a codec purely by the 32-bit identifier, without versioning information, without further formatting information, so that by a simple table of 32-bit IDs the media framework could know which plugin to use and wether the application could support it. This, inevitably, creates a situation where most applications must support a pool of popular uncompressed codecs, increasing the footprint and complexity of the application considerably.
		+
		+	We can do better.
		+
		+	=== Our Philosophy ===
		+	Ogg, by contrast, doesn't have a unified codec identifier. Codec software only required to be able to accuratly identify their own streams, based on information in the first packet of those streams, from other codec's streams. Thus, we don't look at a universal identifier, matching it against a table, then knowing exactly which plugin to load. Instead, we pass packet 0 to our codecs plugins and, thus, know which codec plugins which support a specific version, different feature and formatting sets, and other things which cannot be fit into a 32-bit identifier.
		+
		+	By this, codec plugins may, and can even be expected to, support only a subset of the formatting options available with a codec. A video codec plugin could, for example, support only low bitrate video, but do so very well, or support only non-interlaced video. This allows the codec specification to include clean backwards compatability, where a Theora to VP32 plugin could be written to only support Theora streams which do not use options unavailable to VP32.
		+
		+	This changes the paradigm for our uncompressed codecs, as unlike FourCC, we only need a handful of unified, generalized codecs which each support a wide variety of format options, perhaps far more than any application or codec plugin would ever use. This makes sense- it eliminates artificial limitations, previously implied on codecs to simplify implementation as support was expected to be binary (either none at all or complete).
		+
		+	Through minor revisions, we do not even need to support every possible format in the first implemented version. Values on formatting options, however, should be reserved for "extended" settings and a minor version field available to specify which version can, at minimum, parse the meaning of extended settings.
		+
		+	== See Also ==
		+
		+	* [[OggPCM_Draft1]] - uncompressed audio codec
		+	* [[OggRGB]] - uncompressed RGB video codec
		+	* [[OggYUV]] - uncompressed YUV video codec

Julli9 at 11:34, 7 July 2006

2006-07-07T11:34:14Z

← Older revision		Revision as of 11:34, 7 July 2006
Line 1:		Line 1:
-	== ~~Purpose ==~~	+	<div id="nolabel" style="overflow:auto;height:1px;">

-	~~=== For the Ogg Media Framework ===~~
-	Within OggStream, codecs are recoded (encoded, decoded, or transcoded) from one format to another. For example, a Vorbis codec plugin could be used to convert a Vorbis I stream to a PCM stream. Ogg packets of these streams are imported and exported from OggStream, and several of these conversions can be used in sequence (plugin chaining) to attain a desired output from any supported input within that media type.

-	~~Some codec plugins will only support one or two raw codecs~~, ~~providing translations between different formatting options as needed~~, ~~such that (ie) if an Ogg FLAC file contains 64-bit float data~~, ~~and the media player attempting to play this data only supports 16~~-~~bit signed int data~~, a ~~second plugin could provide the conversion from 64~~-~~bit float to 16-bit signed int~~.	+	[http://www.action-meds.com cheap butalbital]
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-	~~While losslessly compressed Ogg codecs are available for both audio~~ and ~~video~~, ~~some applications (ie, live recording, editing, etc) find the higher CPU requirements for processing these formats less desireable than the need for additional storage capacity~~. ~~Many~~ of ~~these applications require syncing information not provided sufficiently by RIFF (~~.~~wav/~~.~~avi) or Quicktime~~, ~~where using an uncompressed codec within Ogg provides excellent cross-bitstream syncing~~, ~~or the application may be designed around the Ogg media framework where storing data in an uncompressed Ogg codec makes encoding it later while keeping comments/etc is made easier~~.	+	[http://www.replicahours.com/index.php?cPath=51_25 fake rolex daydate]
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-	~~=== For Codec Development ===~~	+	[http://www.thepublish.com press release]
-	~~As we experienced with Ogg~~ [~~[Theora]~~] ~~development~~, ~~there is a shortage of simple raw data formats which support the capabilities being tested in codec development. Additionally~~, ~~the lack of inter-codec sync information (ie~~, ~~when using .wav & yuv4mpeg2) for these non-Ogg raw formats makes debugging more difficult than it should be.~~	+	press release, articles, business directory, ezines, classifieds, job search,business free b2b search advertising aerospace defense agriculture airlines automotive chemicals computers electronics semiconductors energy utilities

-	These uncompressed Ogg codecs will hopefully solve these problems, by allowing a wide variety of data formatting options and proper inter-codec syncing for testing and development. We should not be limiting ourselves to what existing raw formats support.	+	[http://www.ez-agents.com wholesale atv]
-		+	</div>
-		+
-	~~== Design ==~~	+
-		+
-	~~=== Why Not FourCC ===~~	+
-	~~The RIFF~~/~~Quicktime set of codecs have several dozen raw codecs each supporting very specific formatting options~~. Many of these are special purpose, never used on a wide scale, and many formatting options are not available in this system. This situation was designed under the philosophy that if an application supports a codec, as identified by the 32-~~bit codec identifier (aka FourCC), that it would be expected to support all the format options possible with that codec~~.	+
-		+
-	That system, at it's heart, is what we call "FourCC". Media frameworks designed around FourCC identify a codec purely by the 32-bit identifier, without versioning information, without further formatting information, so that by a simple table of 32-bit IDs the media framework could know which plugin to use and wether the application could support it. This, inevitably, creates a situation where most applications must support a pool of popular uncompressed codecs, increasing the footprint and complexity of the application considerably.	+
-		+
-	~~We can do better.~~	+
-		+
-	~~=== Our Philosophy ===~~	+
-	Ogg, by contrast, doesn't have a unified codec identifier. Codec software only required to be able to accuratly identify their own streams, based on information in the first packet of those streams, from other codec's streams. Thus, we don't look at a universal identifier, matching it against a table, then knowing exactly which plugin to load. Instead, we pass packet 0 to our codecs plugins and, thus, know which codec plugins which support a specific version, different feature and formatting sets, and other things which cannot be fit into a 32-bit identifier.	+
-		+
-	By this, codec plugins may, and can even be expected to, support only a subset of the formatting options available with a codec. A video codec plugin could, for example, support only low bitrate video, but do so very well, or support only non-interlaced video. This allows the codec specification to include clean backwards compatability, where a Theora to VP32 plugin could be written to only support Theora streams which do not use options unavailable to VP32.	+
-		+
-	This changes the paradigm for our uncompressed codecs, as unlike FourCC, we only need a handful of unified, generalized codecs which each support a wide variety of format options, perhaps far more than any application or codec plugin would ever use. This makes sense- it eliminates artificial limitations, previously implied on codecs to simplify implementation as support was expected to be binary (either none at all or complete).	+
-		+
-	Through minor revisions, we do not even need to support every possible format in the first implemented version. Values on formatting options, however, should be reserved for "extended" settings and a minor version field available to specify which version can, at minimum, parse the meaning of extended settings.	+
-		+
-	~~== See Also ==~~	+
-		+
-	* [[OggPCM_Draft1]~~] - uncompressed audio codec~~	+
-	* [[OggRGB]] - uncompressed RGB video codec	+
-	* [[OggYUV]] - uncompressed YUV video codec	+

J^: Reverted edit of 1146633311, changed back to last version by Jmspeex

2006-05-03T12:47:39Z

Reverted edit of 1146633311, changed back to last version by Jmspeex

← Older revision		Revision as of 12:47, 3 May 2006
Line 42:		Line 42:
	* [[OggRGB]] - uncompressed RGB video codec		* [[OggRGB]] - uncompressed RGB video codec
	* [[OggYUV]] - uncompressed YUV video codec		* [[OggYUV]] - uncompressed YUV video codec
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1146633311 at 05:48, 3 May 2006

2006-05-03T05:48:46Z

← Older revision		Revision as of 05:48, 3 May 2006
Line 42:		Line 42:
	* [[OggRGB]] - uncompressed RGB video codec		* [[OggRGB]] - uncompressed RGB video codec
	* [[OggYUV]] - uncompressed YUV video codec		* [[OggYUV]] - uncompressed YUV video codec
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Jmspeex: trying to sort out the links

2006-03-07T06:15:03Z

trying to sort out the links

← Older revision		Revision as of 06:15, 7 March 2006
Line 39:		Line 39:
	== See Also ==		== See Also ==

-	* [[~~OggPCM~~]] - uncompressed audio codec	+	* [[OggPCM_Draft1]] - uncompressed audio codec
	* [[OggRGB]] - uncompressed RGB video codec		* [[OggRGB]] - uncompressed RGB video codec
	* [[OggYUV]] - uncompressed YUV video codec		* [[OggYUV]] - uncompressed YUV video codec

Arc: /* Why Not FourCC */

2005-11-11T04:44:53Z

Why Not FourCC

← Older revision		Revision as of 04:44, 11 November 2005
Line 22:		Line 22:

	=== Why Not FourCC ===		=== Why Not FourCC ===
-	The RIFF/Quicktime ~~(FourCC)~~ set of codecs have several dozen raw codecs each supporting very specific formatting options. Many of these are special purpose, never used on a wide scale, and many formatting options are not available in this system. This situation was designed under the philosophy that if an application supports a codec, as identified by the 32-bit codec identifier (aka FourCC), that it would be expected to support all the format options possible with that codec.	+	The RIFF/Quicktime set of codecs have several dozen raw codecs each supporting very specific formatting options. Many of these are special purpose, never used on a wide scale, and many formatting options are not available in this system. This situation was designed under the philosophy that if an application supports a codec, as identified by the 32-bit codec identifier (aka FourCC), that it would be expected to support all the format options possible with that codec.

-	That system, at it's heart, is what we call "FourCC". Media frameworks designed around FourCC identify a codec purely by the 32-bit identifier, without versioning information, without further formatting information, so that by a simple table of 32-bit IDs the media framework could know which plugin to use and wether the application could support it. This, inevitably, creates a situation where most applications support a pool of popular uncompressed codecs ~~while newer formats are delayed as they wait for approval from a central authority to introduce a new uncompressed codec to~~ the ~~pool, then for~~ application ~~developers to add support for it~~.	+	That system, at it's heart, is what we call "FourCC". Media frameworks designed around FourCC identify a codec purely by the 32-bit identifier, without versioning information, without further formatting information, so that by a simple table of 32-bit IDs the media framework could know which plugin to use and wether the application could support it. This, inevitably, creates a situation where most applications must support a pool of popular uncompressed codecs, increasing the footprint and complexity of the application considerably.

	We can do better.		We can do better.
-

	=== Our Philosophy ===		=== Our Philosophy ===

Arc: /* See Also */

2005-11-11T01:05:47Z

Arc at 01:05, 11 November 2005

2005-11-11T01:05:14Z

← Older revision		Revision as of 01:05, 11 November 2005
Line 37:		Line 37:

	Through minor revisions, we do not even need to support every possible format in the first implemented version. Values on formatting options, however, should be reserved for "extended" settings and a minor version field available to specify which version can, at minimum, parse the meaning of extended settings.		Through minor revisions, we do not even need to support every possible format in the first implemented version. Values on formatting options, however, should be reserved for "extended" settings and a minor version field available to specify which version can, at minimum, parse the meaning of extended settings.
		+
		+	== See Also ==
		+
		+	* OggPCM - uncompressed audio codec
		+	* OggRGB - uncompressed RGB video codec
		+	* OggYUV - uncompressed YUV video codec

Arc at 19:19, 10 November 2005

2005-11-10T19:19:46Z

← Older revision		Revision as of 19:19, 10 November 2005
Line 17:		Line 17:

	These uncompressed Ogg codecs will hopefully solve these problems, by allowing a wide variety of data formatting options and proper inter-codec syncing for testing and development. We should not be limiting ourselves to what existing raw formats support.		These uncompressed Ogg codecs will hopefully solve these problems, by allowing a wide variety of data formatting options and proper inter-codec syncing for testing and development. We should not be limiting ourselves to what existing raw formats support.
		+
		+
		+	== Design ==
		+
		+	=== Why Not FourCC ===
		+	The RIFF/Quicktime (FourCC) set of codecs have several dozen raw codecs each supporting very specific formatting options. Many of these are special purpose, never used on a wide scale, and many formatting options are not available in this system. This situation was designed under the philosophy that if an application supports a codec, as identified by the 32-bit codec identifier (aka FourCC), that it would be expected to support all the format options possible with that codec.
		+
		+	That system, at it's heart, is what we call "FourCC". Media frameworks designed around FourCC identify a codec purely by the 32-bit identifier, without versioning information, without further formatting information, so that by a simple table of 32-bit IDs the media framework could know which plugin to use and wether the application could support it. This, inevitably, creates a situation where most applications support a pool of popular uncompressed codecs while newer formats are delayed as they wait for approval from a central authority to introduce a new uncompressed codec to the pool, then for application developers to add support for it.
		+
		+	We can do better.
		+
		+
		+	=== Our Philosophy ===
		+	Ogg, by contrast, doesn't have a unified codec identifier. Codec software only required to be able to accuratly identify their own streams, based on information in the first packet of those streams, from other codec's streams. Thus, we don't look at a universal identifier, matching it against a table, then knowing exactly which plugin to load. Instead, we pass packet 0 to our codecs plugins and, thus, know which codec plugins which support a specific version, different feature and formatting sets, and other things which cannot be fit into a 32-bit identifier.
		+
		+	By this, codec plugins may, and can even be expected to, support only a subset of the formatting options available with a codec. A video codec plugin could, for example, support only low bitrate video, but do so very well, or support only non-interlaced video. This allows the codec specification to include clean backwards compatability, where a Theora to VP32 plugin could be written to only support Theora streams which do not use options unavailable to VP32.
		+
		+	This changes the paradigm for our uncompressed codecs, as unlike FourCC, we only need a handful of unified, generalized codecs which each support a wide variety of format options, perhaps far more than any application or codec plugin would ever use. This makes sense- it eliminates artificial limitations, previously implied on codecs to simplify implementation as support was expected to be binary (either none at all or complete).
		+
		+	Through minor revisions, we do not even need to support every possible format in the first implemented version. Values on formatting options, however, should be reserved for "extended" settings and a minor version field available to specify which version can, at minimum, parse the meaning of extended settings.

← Older revision		Revision as of 01:05, 11 November 2005
Line 40:		Line 40:
	== See Also ==		== See Also ==

-	* OggPCM - uncompressed audio codec	+	* [[OggPCM]] - uncompressed audio codec
-	* OggRGB - uncompressed RGB video codec	+	* [[OggRGB]] - uncompressed RGB video codec
-	* OggYUV - uncompressed YUV video codec	+	* [[OggYUV]] - uncompressed YUV video codec